When an object is in equilibrium state,then

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(C) An object is in equilibrium if the net force acting on it is zero.According to Newton's second law of motion,$\vec{F}_{	ext{net}} = m\vec{a}$.If

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Its net acceleration must be zero

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(C) An object is in equilibrium if the net force acting on it is zero.According to Newton's second law of motion,$\vec{F}_{	ext{net}} = m\vec{a}$.If $\vec{F}_{	ext{net}} = 0$,then $m\vec{a} = 0$,which implies $\vec{a} = 0$ (since mass $m 
eq 0$).Therefore,the net acceleration of the object must be zero.Equilibrium does not necessarily mean the object is at rest (it could be moving with a constant velocity) or that no forces are acting on it (multiple forces can act such that their vector sum is zero).

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